Improvement in heating and feeding air to boiler-furnaces



2 Sheets-Sheet 1.

H SWINDELL.- HEATING AND FEEDING AIR T0 BOILER FURNACES.

Patented MaylG, 1876.

l N f IJLVEIPTUE mllq'EssEs. I

ILPETERS, PI'IOI'O-LITI'1OGRAPXIERl WASHINGTON. D C.

I -Z Sheets-Sheet 2. H. SWINDELL. HEATING ANDFEEDING AIR 'I'O BOILER FURNACES, No. 177,436. W Patented Ma .y16,1876.

HI QEEEEi Y hvEqlnR NPUERS, PHOTO'LITHOGRAPHER. WASHINGTON, D (L .HENRY .sWI DELL, OF ALLEGHENY, PENNSYLVANIA.

IMPROVEMENF IN HEATING AND FEEDINGAIR Td-BOILER-FURNACES.

Specification forming part of Letters Patent No. 177,436, dated May 16, 1876; application filed February 17, 187

To all whom it may concern:

Be itknown that I, HENRY SWINDELL, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a .new and useful Improvement in Boiler-Furnaces; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming part of this specifi cation, in which- Figure 1 is a front view, in perspective, of a boiler-furnace embodying my invention, parts being broken away to show the arrangement and construction of the sidewalls. Fig.2 isthey occur.

My invention relates to the construction of boiler and similar furnaces.

I will now proceed todescribe my inven tion so that others skilled in the art to which currents are employed. The volume of air passing through the heating-chambers will be it appertains may make and use the same.

In the drawing, A A indicate a series of boiler-furnaces, having the grate-bars a a and bridge-walls a a. B are the side and partition walls of the furnaces, built hollow so as to form hot-air flues or heating-chambers B, across which extend a series of check walls or bricks, b 1), preferably alternately arranged, or so as to break spaces, and thus deflect and retard the air currents. The lower portion of the heating-chambers or air-flues B are provided with cross-walls b b forming a tortuous passage, through which the air is admitted, and the upper rear portions of B communicate directly with a transverse or archflue, 0, preferably located directly over the bridge-Walls of furnaces A. O is a flue,

which receives the heated air from the side or heatin flues B and is )erforated as at c c so as to discharge downward and backward into the products of combustion escaping from the furnaces, thus insuring'the burning of anycombustible gases escaping into the lines from furnaces A. d cl are a series of doors or dampers-placed at the mouth, or in The doors or'dampers d d being raised to admit the requisite amount of air, the air passes backward below the diaphragm b and returns through the passage formed by b and 12 as shown by the arrows, escapes thence into the chambers B, and is deflected by the checks or brick-work b l), which break-up any currents that are formed and thoroughly heat the air. From B the heated air passes into the arch or transverse flue O, and escapes into and lningles with .the gas which passes the bridge-walls of furnaces A, promoting combustion in the fines beyond the furnaces, and utilizing to the'full extent the fuel employed. lhe advantages derived from the construction specified are, first, that air-currents, which would be detrimental to the combustion which takes place in the dues in rear of the bridge-walls, are avoided; and secondly,

the checks, which cross the heating-chambers, take up and transmit the heat of the furnacewalls, insuring a full and uniform heating of the incoming air, so that strata of difl'erent temperatures do not form as in heating-chambers, where no'-means of deflecting the airfurnace, the air-flue B, having the series of check-blocks bb and the transverse walls b i 6 substantially as and for the purpose specitied.

- 2. The combination of the airflues B, provided with check-blocks b b and the transverse or arch flue G, substantially as and for the purpose specified.

3. In. combination with the series of air-,-

flues or chambers, arranged in the side walls of the furnaces, the transverse or collecting and discharging flue, substantially as specified. 1

.In testimony whereof I, the said HENRY' SWINDELL, have hereunto set my hand.

' HENRY SWINDELL.

Witnesses:

F. W. BITTER, J r., JAMES I. KAY. 

